Lens for lamps.



. J. A. STEVENS.

LENS FOR-LAMPS.

APPLICATION FILED JULY 24, 1911.

1 31,207. Patenied'ifllly 2. 1912.

iflmesres lu/enter 15 I JM n iyreaf Jierens' 3;. 45W n, W W

i ED sens JOHN ALFRED STEVENS, QF HAYNES fiAfi K, EITGLAND.

LENS Fillil'iz'i MP? figpiicatio'zi filed July es, 151%.

To all whommay concern:

Bait known that I, Jenn ALFRED Srrvsns, a subject of the King of England, and resi dent of Haynes l-erlr. Surrey, England, have invented Lenses for Lamps, of which the foliowing is a specification.

This invention has reference to certain new and useful improvements in lenses for lumps and relates more particularly to in}; British Euteiit No 5191 oil-19%. In such construction of lamps it is necessary to hold the lens to the lamp, so that the lamp-body or casing be extended right up the side. of the lens and turned over at the edge to hold the lens in place, and by this method of fixing the lamp casing not illuminated in any umnncr nor could light, other than the roiys ot light projecting from the face of the lens be seen.

N ow the objectof my present invention is to construct such a lens that not only arethe rays; of light nroiectcd through the face of the lens but the illumination also exlended to the back of the lens without loss to the light projected from the. front of the lens thus rendering the lens suitable formany purposes Where greater area of illumination is required this applying more particularly to illumination in connection with diving operations.

In order that this invention may be more clearly understood, reference is made to the accompanying drawing, in which:

Figure 1 shows a View of a lens. in a. first form of construction, this lens being uppli cable for the illumination of small rooms, railway carriage compartments end the like. Fig. 2 shows a view of a lens, in a second form of construction, and intended for large rooms and spaces. Fig. 3 illustrates a view of a lens oi a third construction, soeciully :ula'pted for diving operations, showing the attachment to a dduble cylindrical which in turn may be secured to or form part of the lampbody, not shown.

In carrying out my invention, instead of forming the buck of the lens as in my previous patent in one cone, 1 form some 311 two conesa and Z Fig 1, both preferably with i the angles or curves in a parallel direction and opening outward, the cone from the edge of the hole a where the lamp is inserted reaching to a line preferably at or near to theend of the lamp hole and the other cone running from this line to the front of the Sueeifieeiion of Leetcni'etent.

Ia/tented y 2. 1912.

ivci'lfll ilo. 646,393.

lens. By this means the larger portion of the smaller cone surrounding the lamp hole forms n flange by which the lens can be connected to the lamp-body (not shown) in any known manner and if I silver the back of the smaller cone and leave the back of the larger cone clear I get a brilliant illumination through the front of the lens and soil!- cient illumination through the buck of the larger lens for ordinary purposes.

in the modification, Fig. 2, the lens is of a flat form and designed so as to be more particularly adapted for use in large rooms and open spaces, the shoulder between the two cones being formed for the reception of clamps or the like suspended by chains or other suitable supports secured to the ceii ing or standards.

In the third modification I form the back of the lens with three cones the shoulder between the cones a and Z l'ieing pre viously described designed to receive the supporting means, in this case 2 easing oi which may be secured to or form part of the lamp-body. The sliouldorbetween the cones'd and 0 serves to provide the means for attachment of erasing j which is also secured to the lamp-body or may form part of same, both casings being arranged so that any admission of water to cavity 0 is prevented.

t is naturally understood tiara-t I may vary the shape of the cones or lenses and the mounting or suspending of the latter without departing from the spirit of the invention.

Havingnow fully desrril d said in vcntion wbat I claim and by Lcttersu' "Extent is The herein described ions lamps, com prising in combination a plurality of integral cones which are in elincenent with one another and which have sliouli'lers formed between their bases and tops respectively, the cone nearest to the apex of the lens being silvered and nrovided with a cavity a, all substantially as and foxfthe purposes specified and shown. a

In testimony whereof i have *ereunro set my hurd in the presence of i re subscribing witnesses. JOHN ALFRED STEVENS.

Witnesses:

H. D. JAMESON,

R. F. WILLIAMS. 

